Definition: It is defined as the time rate of flow of charge through any cross section of a conductor.
Electric current = total charge flowing per time taken.
i = q / t .
It states that the current 'i' flowing through a conductor is directly proportional to the potential difference V across the ends of the conductor, provided physical conditions of the conductor such as temperature, mechanical strain etc. are kept constant.
1 ampere of electric current is produced when 1 coulomb of electric charge passes through the cross-section of the conductor in 1 second.
RESISTANCE:resistance of a specimen of a material is the opposition offered by it to flow of current.
Definition: the resistance of a conductor is defined as the ratio of the potential difference V across the conductor to the current i flowing through the conductor.
Combination of resistors
Consider a number of resistors connected in series by joining them end to end such that same current passes through all the resistors.
Consider a number of resistors connected in parallel by joining one end at one point and other end at another point.
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